Nu-beta-(dicyclohexyl-amino)-ethyl-nu-alkyl-ammonium halides



United States Patent 3,105,073 N-BETA-(DICYCLGHEXYLAMlN0)-ETHYL-N- ALKYL-ANHWONIUM ES Pietro Pratesi, Milan, ltaly, assignor to Maggioni & C.S.p.A., Milan, Italy, a company of Italy No Drawing. Filed July 30, 1959, Ser. No. 830,466 Claims. (Cl. 260-2475) This invention relates to new chemical compounds which have shown a remarkable neurotropic spasmolytic activity and a low toxicity. These compounds also possess an intensive protective activity against peptic ulcers. V

The compounds embodying the invention are monoquaternary ammonium salts as generally pictured on the following Table 1 which indicates their activity and toxicity. For toxicity it is intended herein the LD in mice, for intraperitoneal administration of the medicament; the toxicity rating is expressed in milligrams per kg. b.w.

Activity is expressed in micrograms (0.001 milligram) per 100 mls. of tyrode: it is the dose capable of exerting a spasmolytic action on isolated ileum strips of guinea pigs, when these strips have been contracted by' 5 micrograms per 100 mls. of tyrode of acetylcholine chloride.

TABLE 1 Compound tested Activity Toxicity,

mgJkg.

N-CHz-CHs-IF 5-10 120 7 CH3 -NEKZQHQa as 140 I CH I CH:

TABLE 2 Compound tested Activity Toxicity,

NCH2-CH2-N 10 --NE 011i) 3 100-120 30 -NE(C:H )2 8-10' 20 I CH3 -=(1SO C3H7)2 5-10 30 ice The association of the high activity with low toxicity in the compounds of the invention depends upon the presence in their molecule of at least one hydrogenated nucleus, as it is demonstrated by the comparison with the corresponding aromatic derivatives reported on Table 2 above.

The substance N beta-(dicyclohexylamino) ethylmethylpiperidim'um chloride has been the subject of a particular investigation in order that its action upon peptic ulcers might be ascertained.

Experiments have been carried out on rats, byadministering either orally or by hypodermic injections, in dosages from 15 to 30 milligrams per kilogram b.w. N-beta- (dicyclohexylamino)-ethyl-methyl-piperidinium chloride. The ulcers of the gastric walls of rats were obtained with the ligature of the pylorus, according to the technique of Shay, explained in the publication Shay, H. et al., Gastroenterology, vol. 5, page 43, 1 945.

In the following Table 3 the results of tests made in comparison with atropine and other drugs, and controls (no treatment) are summarized: it is to be noted that the ulceration degrees are reckoned according to an empirical scale, in which grade 5 represents the ulceration of the gastric wall, and grades 1 to 4 represent one, two or more hemorrhagic spots or hemorrhagic areas or nonperforated ulcers.

TABLE 3 Percentage of nonprotected animals Ulceration, degree Treated Tested product and dosages animals Controls (no treatment) 100 Atropine hyped, 2 rug/k Atropine per 0s, 2 mgJkg- N-beta-(dicyclohexylamiuo)-ethylmethylpiperidinium chloride, hyped.

15 mg./ kg

'w'en was I rmoeoo \roq oco N00 mg./kg Propantheline bromide, p. os:

15 mg.lkg l the compounds of the invention are substances having a high anticholinengic power, an antisecret-ory activity on i N--CHaCHz-H alogen C eHn (cyclohexyl) with a secondary aminic base such as dimethylamine, diethylamine, morpholine, piperidine, pyrrolidine and the like, in the presence of a basic condensing agent, such as magnesium oxide or sodamide;

(b) By directly condensing a halogenated derivative as described under (a) above, with a tertiary aminic base such as trimethylamine, triethyl amine, N-methylpiperidine, Nmethylmorpholine, N-methylpy-rrolidine and the like. The invention is illustrated but not limited by the following examples.

EXAMPLE 1 N-Beta- (Dicyclohexylamino)-Ethyl-N-Methyl- Piperidinium Bromide For preparing the tertiary base, a flask is charged with 20.0 grams of beta-chloroethylpiperidine, 12.0 grams of dicyclohexylarnine and 2.7 grams of magnesium oxide. The contents of the flask is heated to 160 C. for 24 hrs. on an oil-bath, with stirring. The reaction product is made strongly alkaline and is then extnacted with ether. The ether-a1 extract is dried up over potash. Ether is distilled oil and the residue is subjected to fractional distillation and the fraction, which 'distills at 172 C.174 C.

under an absolute pressure of 0.6'millimeter of mercury,

is collected. This is N-beta-(dicyclohexylamino)-ethylpiperidine. Yield 28%.

For C H N .-Calcd. percent: C=78.0'1; H=12.4l; N=9.58. Found percent: 78.00; 12.28; 9.20. For preparing the bromide of N-beta-(dicyclohexylamino)-ethyl-methyl-piperidiniurn, 18.4 mls. of a 25% alcoholic solution of CH Br are added to 14.27 grams of the tertiary base. Upon standing for 24 hrs. at -2 C. (minus two centigrades) a white precipitate is obtained which, crystallized from alcohol, exhibits an M.P. of 213 C.214 .C. Yield 14 grams.

For C H N .CH Br.-Calcd. percent:

C=62.00; H=10.l4. Found percent: 61.84; 9.97.

' 0 EXAMPLE 2 V I Beta-(Dicyclohexylamino)-Ethy i-Triethylammonium v Bromide For preparing the tertiary base, a flask is charged with 60.0 grams of dicyclohexylamine, 56.0 grams of betachloroethyldiethylamine and 6.6 grams of magnesium oxide. The mixture is heated on an oil-bath for 24 hrs. at

' 160 C. The reaction product is made strongly alkaline and extracted with ether. The etheral extract is dried up over KOH. The ether is distilled off and theresidue is subjected to fractional distillation, during which a fraction whichhdistills at l88-189 C. under an absolute pressure of 20 millimeters of mercury is collected. This is N-beta-(dicyclohexylamino)'e-thyl-diethylamine. Yield For C H N .Calcd. percent: C=77.08; H=12.94. Found percent: 76.70; 13.28.

' To prepare the, bromide of N-beta-dicyclohexylaminoethyl-triethylammoniuin, grams of the tertiary base are added to 2.6 mls. of ethyl bromide dissolved in.8

mls. of alcohol. Upon standing, a white crystalline pre- I cipitate is obtained which, recrystallized several times from alcohol, has a M.P. of 151 C. Yield 7 grains.

.The bromide analyzes.-Calcd. percent: C=61.67; H=l0.61. Found percent: 61.35; 10.79; 1

EXAMPLE 3 N -Beta- (Dicyclohexylamino)-Ethyl-N- M ethylpyrrolidinum Bromide For preparing the tertiary base, grams of dicyclo hexylamine are mixed with 54.76 grams of beta-chloroethyl-pyrrolidine and 6.6 grams of magnesium oxide. The mixture is heated on an oil-bath for 24 hrs. at 160 C.

5 The reactionproduct ismade strongly alkaline and is extracted with ether. Theetheral extract is dried up over- KOH,'and ether is distilled 0E. The residue is subiected to fractional distillation and the fraction having EXAMPLE 4 N-Beta-(Dicyclohexylamino) -Ethyl-N- Methylmorpholinium' Bromide For preparing the tertiary base, 60 grams of dicyclohexylarnine are mixed with 62.0 grams of beta-chloroethyl-morpholine and 6.6 grams of magnesium oxide. The mixture is heated on an oi'l-ba'th'for 24 hrs. at C: The reaction product is made strongly alkaline and is ex-' tracted with ether. The etheral. extract is dried up over KOH. .The ether is distilled ofi and the residue is rectified, collecting the fraction passing at C-19l C. under an absolute pressure of 1.5 millimeters of mercury. This is 'N-beta-(dicyclohexylamino)ethyl-morpholiue. Yield 32%.

For C H .OH Br.Calcd. percent: C=73.36; H'=

11.63. Found percent: 73.02; 11.62.

To prepare the bromide of N-beta-dicyclohexylaminoethyl-methyl-morpholinium, 5 grams of the tertiary base are added to 6.6 mls. of 25% alcoholic solution of CH Br.

Upon standing a white crystalline precipitate is obtained which, after repeated crystallizations from alcohol, shows a melting point of 187 C. Yield 4.5 grams.

For C H N 'O.'CH Br.-Calcd. percent: (3:58.60; H=9.57. Found percent: 58.35; 9.74. 7

An alternative method for preparing N-beta-dicyclohexylaminoethyl piper-idinium and morpholinium-N alkyl-halides is suggested in the following Examples 10 and 11. a

EXAMPLE I s N-Beta-(Dicyclohexylamino)-Ethyl-N-Alkyl- Piperidinium Halides An example of this alternative method is the condensation of beta-chloroethyldicyclohexylamine with N-methyl piperidine. amine and one mole of N-methylpiperidine are dissolved in 4 .rnls. of alcohol and refluxed for 2 hrs. On cooling and after addition of ether, white crystals are obtained having a M.P. of 225 C. Yield 60%.

The compound N-beta-dicyclohexylamino-ethylpriperidinium analyzes:

For C H N .CH Cl.Calcd. percent: (1:70.04; H: 11.46. Found percent: 69.84; 11.70.

EXAMPLE 6.

Preparation of N-Beta-(Dicyclohexylamiho)-Ethyl-N- Methyl-Morpholinium Chloride One mole of beta-chloroethyl-dicyclohexylamine and one mole of N-methyl-morpholine are dissolved in 30 18,015 ethyl alcohol and the mixture is refluxed for 2 s. scopic White crystals (MvP. 228C.) are obtained. Yield 63% :For C H NgO.CH Cl.Calcd. percent: H=10.81.=?Fou nd percent: 65.85; 11.15.

What I claim is: i I 1. N beta (dicyclohexyl amino) ethyl N- methyl-piperidinium bromide... 4

One 'mole of beta-chloroethyl-dicyclohexyl-' On cooling and addition of ether, slightly hydro-l 2. Beta (dicyclohexyl amino) ethyl triethyl- 5. N beta (dicyclohexyl amino) ethyl N- ammonium bromide. 1 methyl-morpholinium chloride.

N (dlcyclohexyl ammo) ethyl References Cited in the file of this patent methyl-pyn'ohdlmum bromlde.

4. N beta (dicyclohexyl amino) ethyl N- 5 UNITED STATES PATENTS methyl-morpholinium bromide. 2,687,414 Cusic Aug. 24, 1954 

2. BETA - (DICYCLOHEXYL - AMINO) - ETHYL - TRIETHYLAMMONIUM BROMIDE.
 5. N - BETA - (DICYCLOHEXYL - AMINO) - ETHYL - NMETHYL-MORPHOLINIUM CHLORIDE. 